[WIP]: experimental esm loader

[Brooooooklyn]

• Close: https://github.com/Brooooooklyn/swc-node/issues/634
• Close: https://github.com/Brooooooklyn/swc-node/issues/383
• Close: https://github.com/Brooooooklyn/swc-node/issues/120

[Multiply]

We're eagerly waiting for top-level await support.

Can we do anything to help test this?

[DenisGorbachev]

Stuck on ESM support as well, looking forward to this PR merge!

[sam-goodwin]

Is something blocking this change from being merged?

[osdiab]

also waiting for this!

[weyert]

Any way how to progress this PR?

[foray1010]

esm/esm.js is not included in v1.6.0, so @swc-node/register/esm does not work

> cat node_modules/@swc-node/register/package.json | rg version
  "version": "1.6.0",

> ls node_modules/@swc-node/register
LICENSE  README.md  index.js  lib  node_modules  package.json  read-default-tsconfig.d.ts  register.d.ts

Also, seems node -r @swc-node/register/esm is using require(), it failed to recognize /esm

Error: Package subpath './esm' is not defined by "exports" in node_modules/@swc-node/register/package.json

[jensbodal]

Can someone shed some light on how to use this now that it's fixed?

test.ts

import got from 'got';

const { data } = await got
  .post('https://httpbin.org/anything', {
    json: {
      hello: 'world',
    },
  })
  .json<{data: unknown}>();

console.log(data);

node -r @swc/register test.ts

node:internal/errors:490
    ErrorCaptureStackTrace(err);
    ^

TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts" for /foo/test.ts

[erfanium]

@jensbodal you should use loader for esm. read the docs

node --loader @swc-node/register/esm test.ts

[jensbodal]

Thank you that worked

And my bad I see it in the docs here: https://github.com/swc-project/swc-node#usage

[weyert]

Can we use both -r and --loader at the same time? Or does that not make sense?

[erfanium]

@weyert yes you can use. but i can't tell you something makes sense or not without seeing the actual code.